Marlin_Firmware/Marlin/MarlinSerial.cpp
Robert F-C ab9d183024 Make serial port configurable.
This change makes the choice of serial port configurable so that
wireless capability can be easily added by connecting Bluetooth modules
(such as BlueSmirf or JY-MCU) to the expansion port pins.
2012-11-05 21:34:27 +11:00

324 lines
7.1 KiB
C++

/*
HardwareSerial.cpp - Hardware serial library for Wiring
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Modified 23 November 2006 by David A. Mellis
Modified 28 September 2010 by Mark Sproul
*/
#include "Marlin.h"
#include "MarlinSerial.h"
#if MOTHERBOARD != 8 // !teensylu
// this next line disables the entire HardwareSerial.cpp,
// this is so I can support Attiny series and any other chip without a uart
#if defined(UBRRH) || defined(UBRR0H) || defined(UBRR1H) || defined(UBRR2H) || defined(UBRR3H)
#if UART_PRESENT(SERIAL_PORT)
ring_buffer rx_buffer = { { 0 }, 0, 0 };
#endif
FORCE_INLINE void store_char(unsigned char c)
{
int i = (unsigned int)(rx_buffer.head + 1) % RX_BUFFER_SIZE;
// if we should be storing the received character into the location
// just before the tail (meaning that the head would advance to the
// current location of the tail), we're about to overflow the buffer
// and so we don't write the character or advance the head.
if (i != rx_buffer.tail) {
rx_buffer.buffer[rx_buffer.head] = c;
rx_buffer.head = i;
}
}
//#elif defined(SIG_USART_RECV)
#if defined(M_USARTx_RX_vect)
// fixed by Mark Sproul this is on the 644/644p
//SIGNAL(SIG_USART_RECV)
SIGNAL(M_USARTx_RX_vect)
{
unsigned char c = M_UDRx;
store_char(c);
}
#endif
// Constructors ////////////////////////////////////////////////////////////////
MarlinSerial::MarlinSerial()
{
}
// Public Methods //////////////////////////////////////////////////////////////
void MarlinSerial::begin(long baud)
{
uint16_t baud_setting;
bool useU2X = true;
#if F_CPU == 16000000UL && SERIAL_PORT == 0
// hardcoded exception for compatibility with the bootloader shipped
// with the Duemilanove and previous boards and the firmware on the 8U2
// on the Uno and Mega 2560.
if (baud == 57600) {
useU2X = false;
}
#endif
if (useU2X) {
M_UCSRxA = 1 << M_U2Xx;
baud_setting = (F_CPU / 4 / baud - 1) / 2;
} else {
M_UCSRxA = 0;
baud_setting = (F_CPU / 8 / baud - 1) / 2;
}
// assign the baud_setting, a.k.a. ubbr (USART Baud Rate Register)
M_UBRRxH = baud_setting >> 8;
M_UBRRxL = baud_setting;
sbi(M_UCSRxB, M_RXENx);
sbi(M_UCSRxB, M_TXENx);
sbi(M_UCSRxB, M_RXCIEx);
}
void MarlinSerial::end()
{
cbi(M_UCSRxB, M_RXENx);
cbi(M_UCSRxB, M_TXENx);
cbi(M_UCSRxB, M_RXCIEx);
}
int MarlinSerial::peek(void)
{
if (rx_buffer.head == rx_buffer.tail) {
return -1;
} else {
return rx_buffer.buffer[rx_buffer.tail];
}
}
int MarlinSerial::read(void)
{
// if the head isn't ahead of the tail, we don't have any characters
if (rx_buffer.head == rx_buffer.tail) {
return -1;
} else {
unsigned char c = rx_buffer.buffer[rx_buffer.tail];
rx_buffer.tail = (unsigned int)(rx_buffer.tail + 1) % RX_BUFFER_SIZE;
return c;
}
}
void MarlinSerial::flush()
{
// don't reverse this or there may be problems if the RX interrupt
// occurs after reading the value of rx_buffer_head but before writing
// the value to rx_buffer_tail; the previous value of rx_buffer_head
// may be written to rx_buffer_tail, making it appear as if the buffer
// don't reverse this or there may be problems if the RX interrupt
// occurs after reading the value of rx_buffer_head but before writing
// the value to rx_buffer_tail; the previous value of rx_buffer_head
// may be written to rx_buffer_tail, making it appear as if the buffer
// were full, not empty.
rx_buffer.head = rx_buffer.tail;
}
/// imports from print.h
void MarlinSerial::print(char c, int base)
{
print((long) c, base);
}
void MarlinSerial::print(unsigned char b, int base)
{
print((unsigned long) b, base);
}
void MarlinSerial::print(int n, int base)
{
print((long) n, base);
}
void MarlinSerial::print(unsigned int n, int base)
{
print((unsigned long) n, base);
}
void MarlinSerial::print(long n, int base)
{
if (base == 0) {
write(n);
} else if (base == 10) {
if (n < 0) {
print('-');
n = -n;
}
printNumber(n, 10);
} else {
printNumber(n, base);
}
}
void MarlinSerial::print(unsigned long n, int base)
{
if (base == 0) write(n);
else printNumber(n, base);
}
void MarlinSerial::print(double n, int digits)
{
printFloat(n, digits);
}
void MarlinSerial::println(void)
{
print('\r');
print('\n');
}
void MarlinSerial::println(const String &s)
{
print(s);
println();
}
void MarlinSerial::println(const char c[])
{
print(c);
println();
}
void MarlinSerial::println(char c, int base)
{
print(c, base);
println();
}
void MarlinSerial::println(unsigned char b, int base)
{
print(b, base);
println();
}
void MarlinSerial::println(int n, int base)
{
print(n, base);
println();
}
void MarlinSerial::println(unsigned int n, int base)
{
print(n, base);
println();
}
void MarlinSerial::println(long n, int base)
{
print(n, base);
println();
}
void MarlinSerial::println(unsigned long n, int base)
{
print(n, base);
println();
}
void MarlinSerial::println(double n, int digits)
{
print(n, digits);
println();
}
// Private Methods /////////////////////////////////////////////////////////////
void MarlinSerial::printNumber(unsigned long n, uint8_t base)
{
unsigned char buf[8 * sizeof(long)]; // Assumes 8-bit chars.
unsigned long i = 0;
if (n == 0) {
print('0');
return;
}
while (n > 0) {
buf[i++] = n % base;
n /= base;
}
for (; i > 0; i--)
print((char) (buf[i - 1] < 10 ?
'0' + buf[i - 1] :
'A' + buf[i - 1] - 10));
}
void MarlinSerial::printFloat(double number, uint8_t digits)
{
// Handle negative numbers
if (number < 0.0)
{
print('-');
number = -number;
}
// Round correctly so that print(1.999, 2) prints as "2.00"
double rounding = 0.5;
for (uint8_t i=0; i<digits; ++i)
rounding /= 10.0;
number += rounding;
// Extract the integer part of the number and print it
unsigned long int_part = (unsigned long)number;
double remainder = number - (double)int_part;
print(int_part);
// Print the decimal point, but only if there are digits beyond
if (digits > 0)
print(".");
// Extract digits from the remainder one at a time
while (digits-- > 0)
{
remainder *= 10.0;
int toPrint = int(remainder);
print(toPrint);
remainder -= toPrint;
}
}
// Preinstantiate Objects //////////////////////////////////////////////////////
MarlinSerial MSerial;
#endif // whole file
#endif //teensylu